Forest biomass and carbon sequestration

Effects of Short-Term Storage Method on Moisture Loss and Weight Change in Beech Timber

volume: 39, issue: 1

The Quality of Fired Aleppo Pine Wood (Pinus Halepensis Mill.) Biomass for Biorefinery Products

volume: 39, issue: 2

Open-air fires or forest fires are becoming a key factor in reducing the forest surface areas and
they are one of the major factors of devastation and degradation of forests and forest land and
their ecosystems in the Mediterranean, mainly in coastal karst. They cause extreme material
and economic damage, and they negatively affect biological and landscape diversity. After the
forest fire, significant quantities of fired trees are left behind, representing a significant amount
of lignocellulosic biomass available for conversion into a variety of biobased products. The
question arises as to what degree they are chemically degraded, or whether they still have the
properties required for further application in mechanical or chemical processing.
The main aim of this paper was to study the group chemical composition as a biomass chemical
property of the Aleppo pine (Pinus halepensis Mill.) sapwood before and after the impact
of low ground fire and high fire of the treetops at tree height of 0, 2 and 4 m. Therefore, the
impact of forest fires on the Allepo pine sapwood group chemical composition was studied in
terms of quality for further application in production of biorefinery products. In addition,
research results on group chemical composition of the same unfired and fired Aleppo pine wood
bark from previous study were used for comparison with sapwood from this study.
The obtained results show that the distribution of the main chemical components of Aleppo pine
unfired wood bark and sapwood is similar to the results of previous studies for different wood
species. That means that the bark contains a significantly higher content of ash, accessory materials
(extractives) and lignins, and a significantly lower content of polysaccharides cellulose and
polyoses (hemicellulose) than sapwood. The bark results from previous studies show a significant
difference in reduced ash, cellulose and lignin content, and in the increased accessory materials
and wood polyoses (hemicellulose) content between the unfired and fired wood. Furthermore, the
content of individual chemical components of fired bark at different forest fires heights of 0, 2 and
4 m for each sample did not differ significantly. Contrary to fired bark, no significant differences
have been observed in the chemical composition of sapwood between unfired and fired wood, not
even resulting from different forest fires heights. It can be concluded that the forest fire did not
have any effect on Aleppo pine sapwood, where the fired wood bark took over all the damage
caused by high temperature during the forest fire. In addition, the fired sapwood still retains the
chemical properties required for further application in biorefinery biobased products.

Productivity and Utilization Benchmarks for Chain Flail Delimber-Debarkers-Chippers Used in Fast-Growing Plantations

volume: 40, issue: 1

The study developed robust benchmark figures for the performance of delimber-debarker-chippers
in fast-growing eucalypt plantations, through the analysis of an exceptionally large database
that combined automatically-captured and user-input records. Data for three Peterson
Pacific DDC 5000 H units operated by the Brazilian company Fibria Cellulose were captured
continuously for three years, from 2015 to 2017. During this time, all study machines ran
triple-shift and clocked over 25 000 hours each. The consolidated record included information
for 79 858 delay events, with an average duration of 0.55 hours per event. Delay time accounted
for 57% of total worksite time: mean utilization was therefore 43%. Maintenance was
the most important cause of delays, and accounted for 22% of total worksite time. Interaction
delays came second, and represented 20% of total worksite time. Mean productivity was
88 solid m3 ub (under bark) per productive machine hour (PMH) or 39 solid m3
ub per scheduled machine hour (SMH), depending on whether delay time was excluded or included in the
calculation. The gap between the most efficient and the least efficient operator was 22% and
26% for scheduled productivity and utilization, respectively (this difference was calculated by
taking the figures for the lowest performer as a basis). While the exact productivity figures
reported here may reflect the exceptionally favorable conditions encountered in rationallymanaged
South American plantations, the dynamics revealed in this study may have general
validity and could offer precious insights for rationalizing a whole range of similar operations.


Web of Science Impact factor (2017): 1.714
Five-years impact factor: 1.775
Next issue: January 2019

Subject area

Agricultural and Biological Sciences